IAB Standards

Published Modified

  • Video
  • Video
  • CTV

IAB Standards CTV Mezzanine File ad specs

IAB Standards CTV Mezzanine File ads are horizontal video clips, at least 1280×720 px, delivered as MOV or MP4. They run in the Source file for publisher transcoding (CTV / SSAI) placement on IAB Standards. Encode with H.264 or Apple ProRes video with AAC audio at up to 29.97 fps.

  • min 1280×720 px
  • 16:9
  • 4:3
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Visual

Minimum size
1280 × 720 px
Aspect ratios
16:9, 4:3
File types
MOV, MP4
Recommended size
1920 × 1080 px

Video & audio

Video codec
H.264 or Apple ProRes
Frame rate
29.97 fps
Audio codec
AAC
Channels
stereo
Sample rate
48 000 Hz

Notes & source

  • Highest-quality source the publisher transcodes from
  • 1920×1080 or 1280×720 for 16:9, 1440×1080 for 4:3
  • 50 Mbps VBR preferred (or 15–30 Mbps CBR)
  • 4:2:0 or 4:2:2 YUV, progressive
  • Frame rate by region: 25 fps (PAL), 23.98 fps (24p) or 29.97 fps (NTSC)
  • Native rate preferred
  • Apple ProRes preferred but may exceed some vendors' size limits
  • H.265/HEVC is not yet widely accepted
  • PCM audio is allowed in the mezzanine only
  • 5.1 Dolby may be added
  • No slate, countdown leader, bars or tone

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